Short-term changes in the partial pressure of CO&lt;sub&gt;2&lt;/sub&gt; in eastern tropical Atlantic surface seawater and in atmospheric CO&lt;sub&gt;2&lt;/sub&gt; mole fraction

Oudot, Claude; Andrié, Chantal

doi:10.3402/tellusb.v41i5.15110

Cited by 14 publications

(15 citation statements)

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“…The amplitude was about 85 ppm. To eliminate the temperature effect on pCO 2 , we apply the temperature coefficient of 4%(°C) -1 to the pCO 2 measured (e.g., Oudot and Andrié, 1989). The pCO 2 data corrected show that the biological factors outweigh physicochemical effects associated with temperature adjustment in determining the diurnal cycle.…”

Section: Measuring Procedures Of Pcomentioning

confidence: 99%

“…The equilibrator technique has been used to measure the pCO 2 by many researchers employing a non-dispersive infrared gas analyzer, NDIR (e.g., Fushimi, 1987;Gordon et al, 1971;Oudot and Andrié, 1989;Takahashi, 1961;Weiss et al, 1982;Wong and Chan, 1991). We measured the pCO 2 in the Seto Inland Sea of Japan by the equilibrator technique using the NDIR (Shimazu Co., URA-106).…”

Section: Introductionmentioning

confidence: 99%

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Carbon dioxide in surface seawaters of the Seto Inland Sea, Japan

1993

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Observations were made of time variations of carbon dioxide in seawater, pCO 2 , and in the atmosphere, PCO 2 , in the Seto Inland Sea of Japan. The pCO 2 data showed well defined diurnal variation; high values at nighttime and low values during daylight hours. The pCO 2 correlated negatively with dissolved oxygen. These results denote that the diurnal variation of pCO 2 is associated with effects of photoplankton's activity in seawater. The pCO 2 measured in the Seto Inland Sea showed higher values than the PCO 2 during June to November, denoting transport of carbon dioxide from the sea surface to the atmosphere, and lower values during December to May, denoting transport of carbon dioxide from the atmosphere to the sea surface. The exchange rates of carbon dioxide were calculated using working formula given by Andrié et al.

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Section: Measuring Procedures Of Pcomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbon dioxide in surface seawaters of the Seto Inland Sea, Japan

1993

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“…Taking into account the maximum value of downward carbon dioxide flux=0.4X 10-3molm-2d-1, pCO2=330ppm, B=8.5, and minimum mean thickness of the mixed layer=14m (Oudot and Andrie, 1989), the maximum value of S can be estimated to be about 0.06 ppm d-1. The result is negligibly small compared with the real diurnal change in pCO2.…”

Section: Exchange Rates Of Carbon Dioxide Across the Air-sea Interfacementioning

confidence: 99%

“…The examples of biological effects on pCO2 reported in the literature have been scarce. Recently, Oudot and Andrie (1989), using data obtained in eastern tropical Atlantic Ocean, showed that the decrease in pCO2 due to photosynthetic fixation of carbon dioxide was about 4.6ppm. This denotes that the biological effect on pCO2 in the Atlantic Ocean is close to that in the Pacific Ocean.…”

Section: Diurnal Variation Of Pco2mentioning

confidence: 99%

“…Open circles in pCO2 are the raw values measured, and solid circles are normalized values at the constant salinity of 33.8 and constant seawater temperature of 29.9C. The normalization is carried out using the salinity coefficient of 44 ppm pCO2 per salinity unit (e.g., Oudot and Andrie, 1989) and a temperature coefficient of 4.3%pCO2/C (e.g., Peng et al, 1987). Though the variability of pCO2 is limited within narrow ranges from 329 to 333ppm, it is interesting to see that modified values of pCO2 show a diurnal variation, with low values in the daylight hours and high values in the nighttime.…”

Section: Diurnal Variation Of Pco2mentioning

confidence: 99%

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